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%I #4 Feb 24 2012 12:51:03
%S 1,0,0,0,-12,60,-90,420,-2240,-56448,607320,-1834800,23242824,
%T -229079136,-4388159776,77755073760,-443094745600,10064071501184,
%U -151026375297216,-1331806005060480,38225434479768448
%N sech(tanh(x)*log(x+1))=1-12/4!*x^4+60/5!*x^5-90/6!*x^6+420/7!*x^7...
%K sign
%O 0,5
%A Patrick Demichel (patrick.demichel(AT)hp.com)
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